When building some of the boot loaders with clang, and DEBUG_FLAGS or

CFLAGS having '-g' in it, clang outputs several assembly directives that
are too new for our version of binutils.

Therefore, assemble the resulting .s files with clang instead.  A more
general solution can be implemented when a GNU as-compatible driver for
clang's integrated assembler appears.

Reported by:	dougb

sys/boot/i386/Makefile.inc

@@ -11,6 +11,7 @@ LDFLAGS+=	-nostdlib
 
 .if ${MACHINE_CPUARCH} == "amd64"
 CFLAGS+=	-m32 -march=i386
+ACFLAGS+=	-m32
 LDFLAGS+=	-m elf_i386_fbsd
 AFLAGS+=	--32
 .endif

sys/boot/i386/boot2/Makefile

@@ -89,6 +89,9 @@ boot2.out: ${BTXCRT} boot2.o sio.o
 	${LD} ${LDFLAGS} -Ttext ${ORG2} -o ${.TARGET} ${.ALLSRC}
 
 boot2.o: boot2.s
+.if ${CC:T:Mclang} == "clang"
+	${CC} ${ACFLAGS} -c boot2.s
+.endif
 
 SRCS=	boot2.c boot2.h
 

sys/boot/i386/zfsboot/Makefile

@@ -86,6 +86,9 @@ zfsboot.out: ${BTXCRT} zfsboot.o sio.o drv.o cons.o util.o
 	${LD} ${LDFLAGS} -Ttext ${ORG2} -o ${.TARGET} ${.ALLSRC} ${LIBSTAND}
 
 zfsboot.o: zfsboot.s
+.if ${CC:T:Mclang} == "clang"
+	${CC} ${ACFLAGS} -c zfsboot.s
+.endif
 
 SRCS=	zfsboot.c